package com.demo.security.util;

import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

import java.security.MessageDigest;

public class PwdEncode {

    /**
     * @Description 收集
     * @param pwd
     * @return String
     */
    public static String encode(String pwd) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = pwd.toCharArray();
        byte[] byteArray = new byte[charArray.length];

        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16){
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }

    /**
     * @Description 解密
     * 一次加密之后，需要两次解密
     * @param pwd
     * @return String
     */
    public static String decrypt(String pwd) {
        char[] a = pwd.toCharArray();
        for (int i = 0; i < a.length; i++) {
            a[i] = (char) (a[i] ^ 't');
        }
        String s = new String(a);
        return s;
    }

//    public static void main(String[] args) {
//        String s = "123456";
//        System.out.println("原始：" + s);
//        System.out.println("MD5后：" + encode(s));
//        System.out.println("123456加密的：" + decrypt(s));
//        System.out.println("解密的：" + decrypt(decrypt(s)));
//
//        ////鉴于MD5加密的不安全性，所以建议使用 security 自带的加密工具类 —— BCryptPasswordEncoder 。
//        String s2 = "123456";
//        BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();;
//        System.out.println("原始: " + s2);
//        System.out.println("加密1: " + encoder.encode(s2));
//        System.out.println("加密1: " + encoder.encode(s2));
//        System.out.println(encoder.matches(s, encoder.encode(s2)));
//
//    }

}

